“How do online and offline sampling compare in a multinational study of drug use and nightlife behaviour?”

Online sampling is widely used to recruit hard to reach samples such as drug users at nightlife events. We conducted the first study comparing differences in demographics, drug use and nightlife behaviour between an online sample of young adults engaging with the European nightlife scene, and an offline sample recruited at nightclubs and festivals in Europe. Online participants who attended at least six nightlife events in the past 12 months...